%0 Journal Article
%T A 94-GHz Millimeter-Wave Sensor for Speech Signal Acquisition
%A Sheng Li
%A Ying Tian
%A Guohua Lu
%A Yang Zhang
%A Hao Lv
%A Xiao Yu
%A Huijun Xue
%A Hua Zhang
%A Jianqi Wang
%A Xijing Jing
%J Sensors
%D 2013
%I MDPI AG
%R 10.3390/s131114248
%X High frequency millimeter-wave (MMW) radar-like sensors enable the detection of speech signals. This novel non-acoustic speech detection method has some special advantages not offered by traditional microphones, such as preventing strong-acoustic interference, high directional sensitivity with penetration, and long detection distance. A 94-GHz MMW radar sensor was employed in this study to test its speech acquisition ability. A 34-GHz zero intermediate frequency radar, a 34-GHz superheterodyne radar, and a microphone were also used for comparison purposes. A short-time phase-spectrum-compensation algorithm was used to enhance the detected speech. The results reveal that the 94-GHz radar sensor showed the highest sensitivity and obtained the highest speech quality subjective measurement score. This result suggests that the MMW radar sensor has better performance than a traditional microphone in terms of speech detection for detection distances longer than 1 m. As a substitute for the traditional speech acquisition method, this novel speech acquisition method demonstrates a large potential for many speech related applications.
%K millimeter wave
%K speech acquisition
%K radar sensor
%U http://www.mdpi.com/1424-8220/13/11/14248